Go still has the feature of lightweight threads (goroutines) by default and great communication and synchronization primitives (channels, select) between them.

Go still has the feature of lightweight threads (goroutines) by default and great communication and synchronization primitives (channels, select) between them. For Java you still have to choose either real threads or from one of dozens of not-necessarily-compatible async IO frameworks (Netty, Grizzly, ...). How much that really matters depends on the type of your application. There's also emulation of Gos concurrency through Quasar - but again it's not as first class as Gos features.